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CERN-KEK X-band collaboration. 3 Dec. 2011 T. Higo on behalf of X-band group of KEK. Activities centered at CLIC high-gradient accelerator structures in 2011. Nextef runs for CLIC prototype evaluation T24 ( undamped ) was tested for 2000 hours till earthquake.

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Cern kek x band collaboration

CERN-KEK X-band collaboration

3Dec. 2011

T. Higo

on behalf of X-band group of KEK


Activities centered at clic high gradient accelerator structures in 2011
Activities centered at CLIC high-gradient accelerator structures in 2011

  • Nextef runs for CLIC prototype evaluation

    • T24 (undamped) was tested for 2000 hours till earthquake.

    • TD24 (damped, CLIC prototype) is being tested now.

  • Role of magnetic field

    • Became evident through the tests

  • Nextef is establishing a new test area for

    • Basic studies to understand and suppressbreakdowns

    • Study toward much higher gradient

  • Production of test structures

    • Two pairs of prototypes are being made in 2011

    • Taking benefit from the collaboration with SLAC

CERN-KEK High gradient activities in 2011


High gradient test at nextef
High-gradient test at structures in 2011Nextef

2008 2009 2010 2011 2012

7 10 1 4 7 10 1 4 7 10 1 4 7 10 1 4 7 10

Nextef

KX03 (60cm HDDS)

T18_Disk_#2

TD18_Quad_#5

TD18_Disk_#2

T24_Disk_#3

TD24_Disk_#4

TD24R05?

TD24 Choke?

KT1

Narrow waveguide test

High power components test

RF delivery from KT1 to shield-B

Basic studies at shield-B

CERN-KEK High gradient activities in 2011


Clic test structures fabrication and test t18 td18 t24 td24
CLIC structures in 2011test structures; fabrication and testT18 TD18T24TD24

T24_Disk_#3

T18_Disk_#2

undamped

damped

TD24_Disk_#4

TD18_Disk_#2

CERN-KEK High gradient activities in 2011


T24 run till earthquake and after
T24 run till earthquake and after structures in 2011

TD24 run

Our office

Nextef shield

But fortunately,

It reached the very promising breakdown rate, …..

Waveguide collapse

Exposed to air finish

CERN-KEK High gradient activities in 2011


Achieved gradient

Staphnes structures in 2011presentaion at LCWS11

Achieved Gradient

Tests at KEK and SLAC

Measurements scaled according to:

Same input power as 100MV/m loaded

CLIC RF team

N. Shipman

TD24: September 15th @ KEK

mid-November @ SLAC

Soon @ CERN

CERN-KEK High gradient activities in 2011


Toward evaluatio n of clic prototype damped td24 4 processing for more than 1700 hrs on dec 3
Toward evaluatio structures in 2011n of CLIC prototypeDamped TD24#4 processing for more than 1700 hrs on Dec. 3

Nov. 21

CERN-KEK High gradient activities in 2011


BDR comparison structures in 2011around 250ns

[email protected]

[email protected]

TD24#4

on Dec. 3

at ~ 1700hr

preliminary

[email protected]

[email protected]

CERN-KEK High gradient activities in 2011


T24 3 evolution of breakdown rate shows ever decreasing characteristics
T24#3: Evolution of breakdown rate structures in 2011shows ever decreasing characteristics

We should and we can evaluate the same characteristics

in the CLIC prototype, damped structure, TD24#4.

LCWS2011, Granada (Higo)


Toward evaluation of td24 in nominal clic operation
Toward evaluation of TD24 structures in 2011in nominal CLIC operation

  • Damped structure

    • TD24#4 (present one, close to CLIC)

  • 100MV/m loaded

    • 100 MV/m no-loaded can only be estimated

  • CLIC pulse shape

    • Nextef nominal test is severer in pulse shape, full square pulse of 252nsec

  • Processing continues, integrating more than 1700 hrs.

  • KEK and CERN agreed to evaluate the breakdown rate, close to CLIC requirement, through months of operation.

CERN-KEK High gradient activities in 2011


Nextef expansion for further strengthening the r d
Nextef structures in 2011expansion for further strengthening the R&D

Nextef

X-band

KT-1

X-band

B

KT1-B

A

Pulse compressor

KT-2

C-band

CERN-KEK High gradient activities in 2011


Commissioning of another test area shield b is early next year
Commissioning of another test area, structures in 2011shield-B, is early next year

Single klystron

Transport line

Shield-B

Candidate of test setups being prepared at KEK

CERN-KEK High gradient activities in 2011


Other activities under collaboration
Other activities under collaboration structures in 2011

DDS

damped-detuned cells

Choke mode cavity

Program in collaboration with Tsinghuauniv.

Assembly of whole structure by KEK to serve as an independent production study. We should revisit the fabrication study than that developed by SLAC/KEK.

CERN-KEK High gradient activities in 2011


6th Annual Collaboration structures in 2011Meeting on X-band accelerator structure design and test program

International Workshop on

Breakdown Science and High Gradient Technology

Date: April 18th to 20th , 2012

Place: Seminar hall of 4th building, KEK, Tsukuba, Japan

Chaired by T. Higo (KEK).

Scientific program by T.Higo(KEK) S.Tantawi(SLAC) W. Wuensch(CERN).

Next collaboration meeting in next April,

a high gradient workshop, will be held in KEK.

CERN-KEK High gradient activities in 2011


Cern kek collaboration is a base for worldwide r d toward high gradient
CERN/KEK collaboration is a base for structures in 2011worldwide R&D toward high gradient

Asian collaboration

KEK

Structure fabrication & test @Nextef

Tsinghua, IHEP

Structure design,fabrication & test

US-Japan

SLAC/KEK

CERN/KEK collaboration

US-HG

CLIC

SLAC conducts structure fabrication, high power test & basic research

CERN supports for structure fabrication, high power test & system expansion

CERN-KEK High gradient activities in 2011


Conclusion
Conclusion structures in 2011

  • KEK appreciates the study toward CLIC high gradient accelerator structure.

  • It gives KEK the important understanding and technology toward normal-conducting high-gradient operation.

  • On the other hand, KEK believes that the study offers CLIC an important standpoint.

  • Both CERN and KEK obtain mutual benefit from this collaboration.

CERN-KEK High gradient activities in 2011


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